Apparatus

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sensors Mode-S transponder

A2A915

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27015 · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A2A915
Octal
50524425
Decimal
10,660,117
Country
US
Tail
N27015
Type
B772
Broadcasting now · callsign UAL884 · 39,000 ft
Flights observed
119
Distinct callsigns
20
Country
US
Last broadcast
18m ago

Current position

A2A915 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2A915 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL804 - 9 2026-07-12
UAL875 - 8 2026-07-11
UAL918 - 6 2026-07-12
UAL926 - 5 2026-06-23
UAL819 - 5 2026-07-01
UAL97 - 4 2026-06-26
UAL889 - 4 2026-07-10
UAL22 United Airlines 4 2026-07-05
UAL131 - 4 2026-06-16
UAL96 - 3 2026-06-25
UAL927 - 3 2026-06-23
UAL919 - 3 2026-07-13
UAL888 - 3 2026-07-09
UAL880 United Airlines 3 2026-07-02
UAL879 United Airlines 3 2026-04-19
UAL852 United Airlines 3 2026-04-23
UAL23 - 3 2026-07-05
UAL933 United Airlines 2 2026-06-12
UAL932 - 2 2026-06-12
UAL915 - 2 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL884 - Jul 13, 22:35 UTCJul 14, 05:15 UTC6h 40m
2026-07-13 UAL919 - Jul 13, 12:10 UTCJul 13, 19:20 UTC7h 10m
2026-07-12 UAL918 IAD → LHR Jul 12, 23:40 UTCJul 13, 06:40 UTC7h 0m
2026-07-12 UAL804 HND → IAD Jul 12, 07:20 UTCJul 12, 19:50 UTC12h 30m
2026-07-11 UAL875 SFO → HND Jul 11, 18:25 UTCJul 12, 04:52 UTC10h 27m
2026-07-11 UAL875 SFO → HND Jul 11, 18:25 UTCJul 12, 05:01 UTC10h 35m
2026-07-10 UAL889 PEK → SFO Jul 10, 09:51 UTCJul 10, 22:10 UTC12h 19m
2026-07-09 UAL888 - Jul 9, 18:40 UTCJul 10, 13:05 UTC18h 25m
2026-07-08 UAL673 BCN → SFO Jul 8, 14:31 UTCJul 9, 01:59 UTC11h 28m
2026-07-08 UAL673 BCN → SFO Jul 8, 14:30 UTCJul 9, 02:00 UTC11h 30m
2026-07-08 UAL672 SFO → BCN Jul 8, 01:29 UTCJul 8, 12:19 UTC10h 50m
2026-07-08 UAL672 SFO → BCN Jul 8, 01:20 UTCJul 8, 12:05 UTC10h 45m
2026-07-07 UAL59 - Jul 7, 11:25 UTCJul 7, 22:35 UTC11h 10m
2026-07-06 UAL58 SFO → FRA Jul 6, 21:35 UTCJul 7, 07:30 UTC9h 55m
2026-07-06 UAL58 SFO → FRA Jul 6, 21:22 UTCJul 7, 07:17 UTC9h 55m
2026-07-06 UAL984 - Jul 6, 07:30 UTCJul 6, 18:15 UTC10h 45m
2026-07-05 UAL57 EWR → CDG Jul 5, 22:15 UTCJul 6, 04:25 UTC6h 10m
2026-07-05 UAL22 DUB → EWR Jul 5, 08:45 UTCJul 5, 15:20 UTC6h 35m
2026-07-05 UAL23 EWR → DUB Jul 5, 01:15 UTCJul 5, 06:46 UTC5h 31m
2026-07-05 UAL23 - Jul 5, 01:00 UTCJul 5, 02:40 UTC1h 40m
2026-07-04 UAL56 CDG → EWR Jul 4, 08:00 UTCJul 4, 15:40 UTC7h 40m
2026-07-03 UAL915 IAD → CDG Jul 3, 22:56 UTCJul 4, 05:33 UTC6h 37m
2026-07-03 UAL915 - Jul 3, 22:40 UTCJul 3, 23:15 UTC35m
2026-07-03 UAL919 - Jul 3, 11:30 UTCJul 3, 19:15 UTC7h 45m
2026-07-03 UAL919 LHR → IAD Jul 3, 11:40 UTCJul 3, 19:11 UTC7h 31m
2026-07-02 UAL880 IAH → LHR Jul 2, 22:00 UTCJul 3, 06:45 UTC8h 45m
2026-07-02 UAL818 - Jul 2, 00:15 UTCJul 2, 10:10 UTC9h 55m
2026-07-01 UAL819 - Jul 1, 03:55 UTCJul 1, 11:45 UTC7h 50m
2026-07-01 UAL819 - Jul 1, 02:00 UTCJul 1, 02:15 UTC15m
2026-06-30 UAL818 - Jun 30, 00:09 UTCJun 30, 10:05 UTC9h 56m
2026-06-29 UAL819 - Jun 29, 03:34 UTCJun 29, 10:59 UTC7h 25m
2026-06-29 UAL819 - Jun 29, 01:50 UTCJun 29, 02:09 UTC20m
2026-06-29 UAL819 IAH → EZE Jun 29, 01:41 UTCJun 29, 10:47 UTC9h 6m
2026-06-28 UAL4 - Jun 28, 13:19 UTCJun 28, 14:30 UTC1h 10m
2026-06-28 UAL4 LHR → IAH Jun 28, 13:05 UTCJun 28, 22:49 UTC9h 44m
2026-06-28 UAL924 IAD → LHR Jun 28, 03:09 UTCJun 28, 09:34 UTC6h 25m
2026-06-27 UAL804 HND → IAD Jun 27, 08:05 UTCJun 27, 19:59 UTC11h 55m
2026-06-26 UAL875 - Jun 26, 19:04 UTCJun 27, 00:14 UTC5h 10m
2026-06-26 UAL875 SFO → HND Jun 26, 18:25 UTCJun 27, 05:39 UTC11h 14m
2026-06-26 UAL97 - Jun 26, 00:50 UTCJun 26, 01:24 UTC35m
2026-06-26 UAL97 BNE → SFO Jun 26, 00:53 UTCJun 26, 13:28 UTC12h 35m
2026-06-25 UAL96 SFO → BNE Jun 25, 07:07 UTCJun 25, 20:39 UTC13h 32m
2026-06-25 UAL96 - Jun 25, 07:00 UTCJun 25, 07:30 UTC30m
2026-06-23 UAL927 - Jun 23, 15:59 UTCJun 23, 17:15 UTC1h 15m
2026-06-23 UAL927 FRA → SFO Jun 23, 16:01 UTCJun 24, 02:48 UTC10h 47m
2026-06-23 UAL926 SFO → FRA Jun 23, 03:04 UTCJun 23, 13:15 UTC10h 10m
2026-06-22 UAL969 - Jun 22, 13:10 UTCJun 22, 23:24 UTC10h 15m
2026-06-21 UAL968 SFO → AMS Jun 21, 22:44 UTCJun 22, 08:29 UTC9h 45m
2026-06-21 UAL97 BNE → SFO Jun 21, 00:53 UTCJun 21, 13:18 UTC12h 25m
2026-06-21 UAL97 - Jun 21, 00:49 UTCJun 21, 13:24 UTC12h 35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N27015 page for operator, model, and routing details .

Mode-S A2A915 frequently asked

What is Mode-S code A2A915?
A2A915 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27015.
Where is Mode-S A2A915 registered?
Mode-S code A2A915 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A2A915 broadcasting right now?
Yes. Mode-S A2A915 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2A915, octal 50524425, decimal 10,660,117.
What flights does A2A915 operate?
Mode-S A2A915 has broadcast 20 distinct callsigns, including UAL804, UAL875, UAL918, UAL926, UAL819.